thomas h



(No Model.)

T. H. THOMPSON.

DRILLING MAGHINE.

Patented May 12, 1885.

UNITED STATES PATENT OEErcE.

THOMAS H. THOMPSON, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE SIGOURNEY TOOL COMPANY, OF SAME PLACE.

DRILLING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 317,886, dated May 12, 1885.

A pplication filed September 1. IFS-l. (No model.) v

To all whom it may concern.-

Be it known that I, THOMAS H. THOMPSON,

' of Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Drilling-Machines; and I do hereby declare that the following is a full, clear, and exact description thereof, wherebya person skilled in the art can make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

Like letters in the figures indicate the same parts.

Figure 1 is a side view in elevation of my improved drilling-machine. Fig. 2 is a detail view in cross-section of the column on plane denoted by line :0 w of Fig. 1. Fig. 3 is a detail View, on enlarged scale, in cross-section, of the drill-spindle on plane yy of Fig. 1. Fig. 4 is a detail view in vertical section of the drillfeeding mechanism, and in side view of the loose collar, the feed-lever and stop on plane w m of Fig. 3.

My invention relates more particularly to the centering and to the drill-feed mechanisms of drilling'machines; and it consists in providing the standard or column of the machine with the index line or lines along its length, and the sliding bracket with another line that shall indicate the position of the axis 7 or center of the work on the bracket in relation to the axis of the drill in the adjustable stop, by .means of which the depth of the holes bored by the drill is automatically determined, and also in the safety-clamp for the sliding bracket.

In the accompanying drawings,the letter a denotes the standard or column of an upright drilling-machine; b, the foot of the machine; 0, the head; (I d, pulley-brackets fast to the machine, and c the spindle bracket having arms 6 a, in which bearings are provided for the drill-spindle f.

The pulley f is borne on a tubular exten sion on the arm 0, and is so attached to the spindle f that thclatter may reciprocate freely vertically while rotated by the pulley that is driven by a belt from pulleys on the brackets 11 d in the usual manner.

The slecvef" is held between collars on the 5c spindle f,that rotates freely within the sleeve, and the latter has a series of teeth out on the inner face, forming a rack that is in mesh with the cog-wheel fast to the feed-shaft 9, that is journaled in the bracketarm c and has fast to one end a feed-lever, g. By means of this lever the feed-shaft g is rotated and the spindlef moved up or down at will. A

The loose collar h is seated on an extension,

0", on the bracket-arm 6 between ashoulder on this part and the broadened inner end of the feed-lever g. The collar is split, (see Figs.

3 and 4,) and is provided witha clamp-bolt, i, that has a threaded end fitted in a threaded socket in one part of the collar, and a shoulder taking against the outer face of another part,in which the bolt moves frcely--a common form of clamp device.

A pin, 9', projects from the inner side of the lever, in position to strike the end of bolt i as the lever turns in feeding the drill-spindle, (see Fig. 4,) and this forms the automatic stop for the drill. It is set by loosening the collar and turning the latter by moving the pin 9 against it until the drill has been fed downward the desired distance and then clamping the collar at that point. The drill is then raised, the work placed under it, and any number of holes may be drilled to the same dept-h.

A verticallysliding bracket, 7., is fitted to the column, and it is split vertically on the back and bears a safety-cl amp, I. This safetyclamp consists ofa bolt, l, working in lugs on the bracket on opposite sides of the split, (see Fig. 2,) as in the collar h, a handle, 2 fast to one end of the bolt, and aspring, Z, that, fast to the bracket and to the handle, tends to hold the bracket L' clamped on the column.

The bracket may be readily released, so as 9c to be placed at any desired point on the column by pressing on the handle Z, so as to turn the bolt; but when the handle is released the spring pulls it back with enough power to clamp the bracket and save the latter from falling. The front of the bracket projects across the path of the drill, and has a vertical socket in which a table, m a chuck, or a rest maybe secured for holding various articles while being drilled.

The column bears on each side a vertical index-line, a, preferabl y cut into the substance of the column a, and lines 7; on each side of the upper face of the part of the bracket 7; that grasps the column register with these index-lines when the center of the socket in the bracket is exactly in line with the axis of the drill-spindle. By the use of this index device the bracket can be adjusted horizontally in any part of its vertical path.

I claim as my invention 1. I11adrilling-machine, a cylindrical standard or column having on its surface an indexline, in combination with a sliding bracket also, bearing a line, whereby the coincidence of the axis of the work-holding device on the bracket and the axis of the drill-spindle may be determined at any point along the path of the sliding bracket, all substantially as de scribed.

2. in combination, a cylindrical column or standard of a drilling-machine, and a sliding bracket, 7;, bearing a sat'ety-clamp, Z, consisting of the threaded bolt working in the lugs on the bracket and having a handle, Z and the spring Z, fast to the bracket and to the lever-handle, all substantially as described.

In a drilling-machine, in combination, a drill-spindle, f, bearing a rack, a feed-shaft, g, having a feed-lever, g, with projecting pin or -.-1ug, g and a collar, h, with a clamp device, and a part forming a stop in the path of the pin on the lever, all substantially as described.

4c. In a drilling-inachi11c,in combination, spindle-bracket e,witl1 arm 6-, drill-spindlef, with slccvef having a rack feed-shaft, g, with cog-wheel in mesh with the rack, and bearing-lever g, with pin g'iand collar h, clamped by bolt 27, all substantially as described.

5. In a drill-machine, in combination, a drillspindle, f, bearing a rack, a feed-shaft, g, having a feed-lever, an adjustable collar, h, with a clamp device, and also a projecting part forming a stop in the path of the lever, all substantially as described.

THOMAS H. THOMPSON.

\Vitnesses:

Urns. L. Bnnnn'r'r, 10. 11. DIMoc'k. 

